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Amount of other web-pages linking to your webpage as found from the search engine increases your rank. So if you have people link to you (in return for you linking to them, perhaps), your rating will go up. Also having keywords and people searching the keywords, the closer the match (or the more keywords), the higher up your rank will be.

And the amount of people who go to your website from the search engine will affect it too. The more people to search yahoo, find your website, and click on it at yahoo results in the higher rank you get.